Safety control valve for gas



June 3, 1952 A. L. MILLER SAFETY CONTROL VALVE FOR GAS BURNERS 3 Sheets-Sheet 1 I Filed March 6. 1948 Ere. 4.

1410 Z. M/LAER,

firm/amen June 3, 1952 WLLER 2,599,063

SAFETY CONTROL VALVE FOR GAS BURNERS Filed March 6, 1948 5 Sheets-Sheet 2 Era-.5.

1 a1 5 CI: 5 i I 30 65 e0 FIG. 6.

Aha A M44452,

f/vrz/vroe June 3, 1952 A. L. MILLER' 2,599,063

SAFETY CONTROL VALVE FOR GAS BURNERS Filed March 6, 1948 5 Sheets-Sheet I5 Patented June 3, 1952 UNITED STATES PATENT OFFICE.

SAFETY CONTROL VALVE FOR GAS BURNERS Avy L. Miller, North Hollywood, Calif.

Application March 6, 1948, Serial No. 13,503

Claims. (Cl. 158-138) My invention relates generally to gas valves for controlling the delivery of gaseous fuel to the gas burners of such appliances as water heaters, furnaces, and the like. More particularly, my invention relates to a valve of the class described which incorporates safety features designed to prevent the accumulation of unignlted gas.

In most gas burning appliances for home use, such as automatic water heaters, hot air furnaces, stoves and the like, it is customary to provide a small burner called a pilot which burns continuously and serves to ignite the main or heating burner when gas is delivered thereto. One of the difficulties encountered with such arrangements is that, should a sudden and unexpected draft of air extinguish the pilot light or should the delivery of gas thereto be momentarily interrupted and then renewed, the resulting accumulation of unignited gas presents a very dangerous fire and. explosion hazard. Particularly is this true in the case of thermostatically controlled devices in that the gas accumulation coming from the pilot burner is augmented by gas from the main burner as soon as the thermostat operates to open the main gas valve.

Thermostatically operated safety control valves have been designed in the past, and usually incorporate a thermostatic element responsive to the heat of the pilot burner which element is operatively connected to a safety control valve in a manner to turn off the supply of gas to both the pilot and main burners, should the pilot go out. A major difficulty encountered in such previously designed valve systems is, however, that they seriously interfere with reigniting the pilot burner after operation of the safety control valve. It is obviously necessary to reopen the safety control valve to reinstitute flow of gas to the pilot and main burners before such can be reignited. Thus a manual control for the safety control valve is required which must be independent of the operative controls responsive to the thermostatic element. The provision of such manual control is, of course, simple but fails to take into consideration the human element involved in relighting the pilot after accidental extinguishing thereof.

For example, if the manual control for the safety control valve is turned to on position, the pilot is relighted, and the operator then forgets to return the manual control of the safety valve to its original position. The latter valve will be inoperative should the pilot again fail.

Various arrangements have been evolved to overcome this difiiculty but have heretofore involved a multiplicity of valves and thermostatic elements and somewhat complicated mechanical linkages interconnected between such valves. Other arrangements designed to overcome the difliculty above described include one in which it is necessary to heat the thermostatic element with matches or other independent heating means before the pilot can be reignited.

Bearing in mind the foregoing difiiculties, it is a major object of my invention to provide a safety control valve of the class described which serves to cut off the flow of gas to both the pilot and the main burner of a gas appliance should the pilot accidentally become extinguished.

Another object of my invention is to provide a valve of the class described which cannot be left in an inoperative condition after reignitin the pilot.

Still another object of my invention is to provide a safety control valve operative as above described and further adapted to permit relighting the pilot without the necessity of employing independent means to heat a thermostatic element.

A further object of my invention is to provide a valve of the class described which is capable of meeting regulatory requirements of the Underwriters Laboratory and other such bodies concerning fuel gas control valves.

A still further object of my invention is to provide a control valve of the class described which is compact and relatively simple to manufacture. 7

The foregoing and other objects and advantages of my invention will become apparent from consideration of the following description of a valve embodying my invention, such consideration being given also to the attached drawings in which:

Figure 1 is a perspective view of a valve embodying my invention as incorporated in'the fuel supply of a typical gas appliance burner system;

Figure 2 is an elevational section on the line 2-2 in Figure l;

Figure 3 is an elevational section taken on the line 33 in Figure 2;

Figure 4 is a horizontal, fragmentary section taken on the line 4--4 in Figure 3;

Figure 5 is an elevational section taken on the line 5-5 in Figure 2; I

Figure 6 is an elevational view similar to Figure 3 but showing the valve in an operated position;

Figure 7 is a view similar to Figure 5 but showing the parts of the valve in the operated position illustrated in Figure 6;

Figure 8 is a fragmentary, elevational section taken on the line 8-8 in Figure 2;

Figure 9 is a fragmentary elevational view taken on the line 9-9 in Figure 2 with a portion of the valve broken away to reveal interior parts;

Figure 10 is an elevational section, similar to Figure 7 but showing the parts of the valve in an intermediate position during the reigniting operation thereof; 7

Referring now to the drawings and particularly I to Figure 1, it will be seen that theyalve embodypliance which includes a main burner 20 and'a pilot burner 2!.

burner 20 from a main supply vpipe. 22 through the valve embodying my invention andindi'cated generally by the reference character 23,; gas being delivered from the Valve to the burner by a tube :12?! w l -b -u ier their P enu e -r or-mi ineei wi h; he wqe 'dbs ibl i' 'co v tior a sa b rne imq'siishle 51511111111 chamber formers no partof t he; *tion,=-however, it is not included the drawings and:the -repres entation of the burner gil may be *considered; as schematic and for illustrative .'-purposes-'only. V l Gas' forr the-pilot; burner 2 l is supplied to the valve Zfro'nna smalr pipe 25-;a'nd isdelivered from the valve into-theburner 2| through a" tube 25. lt'will be understood that thesma-ll'supply tube 25" ma'yi'incl'udes 'a' regulating: valve {not shown) therein upstream from the control valve23' illust-{rated liereinithepurpose'of said"upstream regulating va'lve 'being to regulate the'amountof gas *s iipplied through"the small'pipe 25. Since such regulatingwaivesare we'll known inttheart; this "'elemnt too'is oinitted from the'dr'awi'n'gs.

V The manually operable members of theva'lve 2 stampin a 'kniirled knob '2 6 and a 's'ciuare push Qt't'o'n 2? f coa'iiia'llyfpositioned in i'tlie' center 'of nob The 'j' mode of eparation "and the function of -the knob 26 and' the button-"21 will be described in detail' hereinafter. H

The'*' thermostatic element which functions to iefict closure of the} ontrol"valve 23* u'pon failure 'of tIipiIot bdrher 'Z l; cbrnpri'ses a' heat responsiv e rod 28' and a fiat leaf spring 29 conheted it fl hts? e p is 'sezr a a curedat its'rearwa rd end to the body ofthevalve;

Z3 b iihi alns o tsr wsfizb' e s rine'extjexi in I '1 Q avingjafreeend threofproj'ectgjritdtlflkpbfilfiasbestheeii'irir'igllle The r0628 is'attacl'id 'to'theleaf lhgjZQ adjacent the center thereof by means ofj'asingle screw 33 threaded'intotherod'28 as shown-iii Figure 4.

The pilot burner 2 I is provided with a number of upwardly .directedl jtslflf which serve to'fapply heat to 't h efrod'i 28 when "the? pilot burner is in operation, aiid' horizontally' kiirectedJets- 4| wh h serve -iq.-..,q ysr a shins Tfij ine its: the

fl'main burner 2 0 ;thus to perform the pilot" function of the burner 2|. I

Theheat resp onsive'rod 28 is constructed-of a -material WhiChjWiH resist the corrosive action ;of.

the burner jets 40 and having' arelativelyhigh coefi'icient or thermal expansion whereby when said rod is heated ifi extendsgto' move the' leaf spring 29 toward the 'bodypfthe-'valve 23"-'to a position shown in full" line in "Figure 4, whereas 7 contractionof'therod 2 8"Which takes place upon the burner jets 4 0 b'eingfextin'guished,causes "the rod 23 rd pull the' leaf s img ze away -from the body of the 'vai've z 3" to a position shown in phantom line in Figure 4. i

Gas is pp d to' the-'main;10I-jets M3 in the" pilot burner 21.

It will be further noted from an examination of Figure 4 that the mechanical motion of the inner'end oi therod 2'8";jat' the screw '33 is amplif fi'ed at the free end of the' IeafESpii'ngQQ within the knob 26. As described in more detail later herein, the free end of the leaf spring 29 is em ployed as one member of a latch merchanism serving 'to' hold the valve 23 in open or on position so long as the rod 28 is heated by the burner Upon cooling of the rod 28, the spring 29 is moved to the phantcir'dlirie position shown in Figure 4, to release the aforesaid latch mechanism and permit a helical torsion spring 35 Within the knob Elite closethe valve. I v

For a more detailed' description :oi -tha valve operation; reference should now be had to l 'gigure 2; wherein the interior operative portions of the 1 valve are illustrated. The :val-ve 2 3 i-ncludes in 0 addition to the" manually'roperable knob 2 G and the button "2.7 a two-piece" body includingwthe main supply body portion 43 and the pilot supply body portion '44. The main body-"porti'onmfiand the pilot body portion l l are secured together 'by suitably positioned '-'att'achrnent screws 39 threaded" into 1 the maim body portion"- E3 "d a i gas-tight gasket '62 is pos'itioned bfetvfe "body portions" 43 i and ld to' -hermetical'ly seal i-nte'rior' cavitiesin the" embers. I

The main'body porti'on 434s prb'v'idd a vertical pa'sSage' lE hereth oughwh'ich is -providedwith" threaded Epfiing 46 thereirradapted toreceive conventional fittings' for the attach- :3 rnent of the supply pipe 22 a'nditube 24.

The pilot body artisan saug'prcviuedwith fa passage 41 "therethrou'gh havingIthieadd 'openfing 4 3 adapted to receive thelsupplypipef and the tube 24 throughwhicli pilot'g'as is conducted from the body portion '44 t6 thefpil'ot burner z I V Coaxially mounted within the body "poiftiiins' "E3 'ar'id' 4:? are tlifeeiotary core-members; the na- "ture of which is "best" seen rrbm'en' k'ali'iinati'on f I of V'Figure l2. "The" three rotary core members comprises a pn'otvhvecoreT5o,"ihavmg1meansverse opening 47a therethrough, an 1n nercore 511 having a 't-rersv se bp'emg b therethrough, 7 and an" outer conical core--5 2 havingwan"interir'upted transverse opening 45a --therethrough. The transverse openings 45a; fi-fiband- 4M in the various core members-are positionedand adapted to be 7 placed in alignmenirwith the gas-passages ii-and 41 to permit -flow of gas tothe mairi and -pi1ot burners. Such alignmentof--'the, pas'sages is accomplished' -byappropriate "rotation oflthe core members as twill bedesc'ribedwh'ereinaifter.

Y --,'-I"he assembly and mode of operation'to "the three corem'embersfiikfi hand 52 'isbest seeri in -Fi'gure 2. F Here it will'be seewthat Tthefinner eore (so -member 5 I is concentricallyinoiintedw the conical core member 52 andm'akes gas ti'g ht, cylindrical contact therewith. The conical iiore 52 isgin tdrnyniounted in a suitable conica seat connection therewith.

4 InFigu-re's 2 am 12} it '50 amt-s1.

whereon A compression spring 54 is positionedin terminal c'avities 55 and 56 in the inner core and the pilot core 59, respectively. The thrust of the compression spring 54 is such as to tend to push the core members 50 and 5| away from each other, the purpose being to force the member 5| into tight sealing contact with the conical core member 52 at the end surface 55 of the inner core member 5|. A thrust washer 56 is. positioned between the end of the core 5| and the inner end of the cylindrical recess in the conical core member 52, the purpose of the thrust washer 56 being to prevent galling of the members 5| and 52 since these members are preferably constructed of the same material, for example, brass. To accomplish its purpose, therefore, the washer 56 should be preferably of a different material than that of the members 5| and 52.

The resultant thrust on the pilot core 50 is taken by a single ball thrust bearing 51 located at the bottom of the cylindrical recess in the pilot body 44.

- As can be seen best in Figure 12, the conical core member 52 is shouldered at its outer end and provided with a threaded extension 66 having parallel flats 6| formed therein. The threaded projection with the flats 6| is received in a coordinately shaped opening in a rear wall of the knob 26 and projects into the hollow interior thereof. An attachment nut 62 is screwed onto the extension 69 whereby to secure the knob 26 thereto for driving connection therewith by virtue of the flats 6|. Thus rotation of the knob 26 is effective to rotate the conical core member 52.

As can be seen best in Figure 3, the bottom or rear wall of the hollow knob 26 is provided with an arcuate opening 63 which opening has a two-fold purpose. One purpose of the opening 63 is to admit the free end of the leaf spring 29 as previously described while still permitting limited rotation of the knob 26. The other purpose of the opening 63 is to provide limiting stops for the rotary motion of the knob 26. To accomplish this latter function, a stationary stop pin 64 is secured in the main body portion 43 and projects outwardly into the hollow knob 26 through the arcuate opening 63. A shoulder 65 is provided in the inner edge of the opening 63 in position to engage the pin 64 to limit counterclockwise rotation (in Figure 3) of the knob 26 whereas clockwise rotation thereof is limited by the end 66 of the arcuate opening 63 striking against the pin 64. As can be seen in Figure 3, the permitted rotation of the knob 26 and of the conical core member 52 driven thereby is approximately 90.

It will be noted that the pin 64 also forms an anchorage for the torsion spring 35.

The inner core member 5| is provided with a stem 68 which is of suflicient length to project outwardly beyond the extension 60 on the conical core member 52, a suitable opening 69 being provided in the latter member. A cross pin 19 is secured in the stem 68, the pin 19 being of sufficient length to engage the stop pin 64 whereby to limit counterclockwise rotation of the inner core member 5|. As can be seen in Figure 2, the torsion spring is anchored against the cross pin 19 and the arrangement thereof 18 such as to urge counterclockwise rotation of the inner core member 5|, thus to place the cross pin 19 in engagement with the stop pin 64.

The pin-10 also serves-as a latch member .for

cooperation with the free end of the leaf spring 29 as previouslydescribed. The latching operation is illustrated in Figure 9 wherein it will be seen that clockwise rotation of the inner core member 5| carries the cross pin 10 past the free end of the leaf spring 29 so that when the spring 29 is; in its innermost or hot position, the pin Hi-cams the spring 29 outwardly until the pin has rotated beyond the spring 29 at which time .the spring snaps into the position shown in full line in Figure 9 whereby to retain the cross pin wise rotation until the cross pin Ill reaches the stop pin 64.

The purpose of.the manually-operable push button 21 in the knob 26 is to serve as a clutch to engage the knob 26 with thecross pin 10 in order to manuallyrotate the latter in clockwise direction to re-engage the same with the spring 29 as above described. To this end the push button 21 is provided with a pair of diametrically opposed U-shaped notches H, one of which may be seen in Figu're, which notches H are adapted to engage the cross pin .19 when the push button 21 is pushed inwardly. .Such inward motion of the push button 21 is opposed by a compression spring 12 which isanchored in a recess in the outer end of the stem 63 and thrusts against a single ball thrust bearing '13 in the inner end of an interior circular recess 14 in the button 21. The button 2'! is also provided with a radially extending flange 15 which engages a cover 16 of the knob 26 to limit outward motion of the push button 21 urged by the compression spring 12. The cover 16 is secured to the knob 26 by screws 11, threaded into the body of the knob 26.

The opening in the cover 16 through which the push button 21 extends is square as is the button 21, whereby to effect driving connection between the knob 26 and the button 21.

When the push button 21 and the cross pin 19 arein such relative position that the notches 1| may engage the pin (0, pressure on the button serves to effect driving connection between the knob 26 and the inner core. member 5|, whereby rotation of the knob 26 in a clockwise direction rotates both the conical core member 52 and the inner core member 5| and the pilot core 56. The relative direction of the various openings through the core members 59, 5| and 52 can be best understood from an examination of Figures 5, 6 and '7. When the cross pin 10 is against the stop pin-64 and the shoulder 65 in the knob 26 is also against the stop pin 64, which position is illustrated in Figure 6, the arrangement of the passages is that shown in Figure 7. In Figure 7, it will be seen that the transverse opening 41a in the pilot core 59 and the opening 45b in the inner core 5| both lie transverse to the respective passages 41 and 45 in the body of the valve 23. Thus both the main and pilot gas supplies are shut off when the valve is in the condition illustrated in Figure 7. This is the condition which obtains immediately after the operation of the thermostatic latch mechanism previously described.

When it is then desired to relight the pilot, it will, of'course, be necessary to rotate the pilot core to a position where the passage 41a is sag-5993063 27 rzalignd zwith the pilot passage l'l-'zthrough'rthe bodyportion 44; 'iTo accomplish thisaligmnent bf atheopening 41alitiisnecessar atorrotatei theipiiot c'ore' 'and coneurreritlyithe innerieore members "Ilation bfsga'sl to take place: evenilduringitheftime irmedessarw to strike: a matchrtoiignite thez pilot. itStri'king the 'match andattempting: to light :the :2rpilotfimight then'result inzia dangerous 'explosion.

in a clockwise dii-eetion fthroughi approximately 5 lTherateofrgas supplied/toitheiipilot burnerzzl,

-90. Tomanuallyz'rotate thi innem core" member by meansoffthe knob32 ii,i'-itilislmecessaryi that these twoiparts:bei kslutchedttogether byaneans oi: the pusht button 2 1. V

i. The;relative positionxbfzitheiknob 2 Strand: the: lcross pinifm re'quiredto'enabla'engagementiofizthe push buttoniwithi the/latter islillustrated in Eigvkrei 6. W'ith the :partsxint thisfrelativee position,

the push button flwiscdepre'ssed landzth knob 26 l :is' rotatedfi clockwise; carryingxthei' orossispin U around toithe positionish'ownsin' Figure3. This #serves w-toiplace the'itr'ansversei openings flatand 45b in iopen xpo'sition whereby tcr supplm gas to the burner 2| and to remove the bldcktng-action r-howeveryis so'zslow as to obviate :the possibility-oi tsuchia dangerousraccumulation 'ofigas' during the time'fr'equired toi igriite the pilot burner.

Iti should be noted that .thezarrangement. just ildescri'bed is substantially foolproof in' that' there zisino :wayl in 'which the "operator oan: open: the :main :fuel supplyuntil "the pilot burner' has :actua'liyvbeen ignited wherebyzto heat the rod '28. Furthermore,'should the: operator fail to ignite :15 -the: :pilot and release his hold on the= knob =26 and the pushbutton: 21', the'valve will immediately be returnedto a blosedapos'ition hy-virtue of: the torsion spring-35. The torsional's'trength of the spring is sufficient so that this spring iscaofithe inner: c'ore member" 5| ii -zzol p'able of rotating not only the inner core-and pilot cconical core memb'er 52 iszsuch i-as torclose (the r I maintiueli' supplyrpassaget45. iThis positionrsis 'illustratedzin'figure l0. -1t1will- -*be'seen,fhowever, sth at ithepilot burner passagei l'his open.

@Since at this pointvirrlthe reig-niting roperation, therod' 2 8 liis-- still coldrthe fleafaspringtisvpulled doutwardlyandfisnot in position toengagethe'end 'i'oftthe cross'pin 10. Thus if the, push :buttonis 'released,it ismoved outwardly by the compressiontspting "12 and :is thereby disengaged" from :cross pin 11L permitting the torsion -spring 35wto .1 rotate the inner/core 5 I rand the pilot core-5orto the transversevor 'Lclosedi position-.:illustrated- :in I I Figure 7 P'Such 1 an arrangement- 1s. provided-so s'that: ifgfor any :"reason the operator vismunable I' "to light the, pilot,:-reiease ofathe puskbuttom 21 swilliautomatically shut o'fi vI the supply of gas thereto and prevent an accumulation fof -iunigxnitedigas.

Continuing now withia-fdescriptioniofathe reig- Lniting operation;athettmtrbhknobi'fi is'heldiin the v r position indicated infiigure 9: and thepushbutton 2 'Lis held down iwherebylto hold: the' corefmembers' imthei relativez positions-illustrated :in Figlure 10. WithLtherrvalve' in: this". condition, the

' pilot is theneignited: and the: controls are: held,

in such :positionzuntil the rod 28 has 'beenisufii 'ci'ently heatedszto movelthe ieafaspring: inwardly :into position toiengagelthe crossipin 10'. -:When such engagement has occu rred releasing-the push score 5 I. and respectively; butwill also, nec- *r'essary; rotate theconical core 52. -Thus=rif the button 2! should inadvertently remaindnengagement with the pin '10 after manualpressure has 25- beenreleased, the torsion spring= 35-willthen -rotate alkof the core members to the-position illusftrated :in' Figures 6' andland-thusshut o'ff both supplies.

If r at any time =-the rod 28: -is' cooled for any gorireason eitherbyv extinguishing of the pilot or -:by reduction in gas pressure rsuch as torender the pilotburner 2 I incapable ofzigniting the main burner=20,- the latch mechanism previouslydescr ibed is-operated to release thepin'm and-shut 5 ofi thezgas supply. 7

While the valve shown and described-herein isfully capable of vachieving the ob'je'cts-and providing the advantages hereinbefore: stated, -it will be realized that it is capableof considerable mod- -qo-ificatiori by those skilled in'the art without de- J- parting from thespi-rit of the invention. Forthis reason, I do not'mean-toberlimitedtothe form shown-and described but rather "to the scope: of 1 the appended? claims. m f Itilaim:

' 4.1;- l'ni'a control valve fara. gas --burning--appli- .ance of the type-havinga main burner and a pilot iilburner, the combination of Ineanshavingsepara'te passagew ays' adapted for connection -to-said ibmm'erslto supply gas-"to saidimainbu-rner and-t0 said pilot burner; manually operable valve means :rin one of said passageways. to control the 'fl0W '0f .z:gas:tozsaid main 'burner;--.automatic valve means :zadjacentl to, and: independent: of: said manually button: 2 I willrnot rcauseithe gas supply r toath operable means to control; :fiow f 1 gas to said pilot burner 2| to beshut dfi since thecross piece" 10 and consequentlyvthei.innercorerandtpilot core 5! and 50 respectively are held imopen position bythe latching operation oi thmspring-= 29.

imainxburner, said automatic means including a :thermostatic latch mechanism havinga thermal element positioned and-adapted to respond to zthel heat of: a' 'pil'ot bu rner' connected toaone of l 'beremembeledFhoweveri that lthcom' 5: 0 said passageways to :normally f-hold said auto- -calcore member was rotated to passage-blocking position as illustrated in 'Eigurelwdn order to open. thez-pilot passage 41. 'Ihus after': igniting r the pilot and heating' therodn soias-sto maintain counterclockwise direction until the'J-shouldenGS" strikes against ther'stopapin -M whereby to -open the mainburner? suppiyi passage 41: as "shown in L Figurer5.

ma'tic means: in? open; position-while said pilot :rbtzrnercis rignitedand 'spring means urging-said -':automaticv means'rtoward closed-position; valve nieansito" control the-1 flowfbfsrgas to said pilot burner; said-pilot valvelzmeans being roperatively -co mected'to' said" automatic": means for concurrentr motion therewith, therelative; positions of asaict automatic me'ansxbeing such that-:thgsame andrisaidz pilot control means rare always 1 simul- Th'm'ode of Operation justidsclibediimwhichrqo citaneouslylopen *or' simultaneously: closed; and

-the' 1. main burn'er supplyriisfshut ofi :duringuthe reigniting operation is necessary since itzis undesirable thatarelatively large flow-of: gas t'akes -"-place uzitil the pilot has beemignited. 2 Otherwise izmeansi-lm'ovable toropen said vautoma-tic-means zzagainst the urging" of: said: spring: means,":-said i opening Ime'ans including -=c1utching means :to

connect 'said-automatic means'withsaid manually 5 it would be' possible -for a considerabletaccumu-k -:operab1e contro1 means when sflid :l sm means are in such relative positionthat one is open and .the other closed whereby opening of saidautomatic means is accompanied by closing of said manually operable means to interrupt flow of gas to said main burner.

2. The apparatus set forth in claim 1 further characterized by the fact that said clutching means includes a member adapted to be manually moved against yielding pressure means whereby to engage said clutching means and whereby release of manual pressure against said member disengages said clutching means and permits said spring means to return said automatic means to closed position unless the latter is held by said latch mechanism.

3. In a control valve for a gas burning appliance of the type having a main burner and a pilot burner, the combination of a valve body having a first passage therein adapted for connection to conduct gas to said main burner and a second passage therein adapted for connection to conduct gas to said pilot burner a first valve member in said body movable to close said first passage; a spring urged second valve member movably mounted in said body andadapted to normally close said first passage; thermostatic latch mechanism adapted to engage and hold said spring urged member in open position, said latch mechanism having a thermal element positioned to respond to heat of said pilot burner to hold said latch in said. engagement whereby failure of said pilot burner disengages said latch mechanism to permit closing of said spring urged memher; a third valve member in said body movable to selectively open or close said second passage, said third valve member being operatively connected to said'spring urged member for concurrent opening and closing movement therewith; and manually operable means to concurrently return said spring urged member to open position and control said main burner, said manually operable means including means for effecting driving connection between said first and second valve members when the latter are in opposite positions, said second valve member being inaccessible for independent manual operation whereby opening of said second valve member can be accomplished only by closing motion of said manually operable means to shut off gas supply to said main burner and said driving connection means being releasable to permit independent movement of said first valve member whereby said manually operable means may be reopened after motion to open said spring urged member.

4. In a control valve for a gas burning appliance of the type having a main burner and a pilot burner, the combination of a valve body having a first passage therein adapted for connection to conduct gas to said main burner and a second passage therein adapted for connection to conduct gas to said pilot burner; a valve member in said body movable to close said first passage; separate valve means mounted in said body to normally close said first and second passages, said separate valve means being movable to a position to open said first and second passages and including a spring connected to urge said separate valve means to closed position; thermostatic latch mechanism having a member adapted to engage and hold said separate valve means in said open position against the urging of said spring, said latch mechanism being responsive to heat of said pilot burner to hold said separate valve means as aforesaid whereby failure of said pilot burner disengages said latch member to 10 permit movement of said separate valve means to close said passages; and means to control said valve member and separate valve means, said controlling means including an operating handle connected to said valve member andadapted for manual operation to move said valve member selectively to open or closed position,'and a clutch member carried by said handle adapted when in a predetermined position to make driving engagement with said separate valve means to move the same concurrently with said valve member whereby to move said separate valve means to open said first and second passages when said valve member is moved to closed position.

5. The apparatus set forth in claim 4 further characterized in that said clutch member is normally spring urged into disengaged position and is engageable by manual pressure whereby the release of said manual pressure disengages said clutch means and permits said separate valve means to return to said closed position unless held open by said latch member.

6. In a control valve for a gas burning appliance of the type having a main burner and a pilot burner, the combination of: a valve body having a passage therethrough adapted for connection to deliver gas to said main burner; a pair of valve members in said body, each independently movable to close said passage; thermostatically controlled means to close a first of said valve members upon failure of said pilot burner; normally disengaged clutch means manually oper-- able to connect said valve members for concurrent movement, said clutch means being engageable at only such relative position of said valve members wherein one is open and one is closed whereby said concurrent movement closes one valve member while opening the other; and pilot valve means adapted for connection in the gas supply of said pilot burner'to control flow of gas to saidpilot burner, said pilot valve means being connected for concurrent movement with said first valve member to open or closed position thereof.

7. A control valve for gas burning appliance of the type having a main burner and a pilot burner, which comprises in combination: a valve body having a passage therethrough adapted for connection to said appliance to deliver gas to a main burner in said applicance; a rotatable valve member mounted for rotation in said body, said valve member having a transverse opening therethrough adapted to be aligned with said passage and having a substantially gas tight fit with said body whereby to hermetically seal said passage upon rotation of said member to move said opening therethrough out of alignment with said passage; a core member rotatably and coaxially mounted within said valve member, said core member having an opening therethrough alignable with said valve member opening, said core member having'a substantially gas tight fit with said valve member and being independently rotatable to close said passage; a rotating knob secured to said valve member to manually rotate the same selectively to open or closed position in said body; a rotary spring secured to said core mem her and anchored to said body, said spring being stressed to urge said core member to a normally closed position; a push button carried by said knob having driving engagement with said knob and beingselectively slidable therein to engage said core member whereby to connect said knob and core member for concurrent roabec oeee tation; said "'push button' being positioned aw adapted to'engage'said coremember only when said; valve member and saidcore'-member'iare" in K i such relative position: that on"is-;closed and"the-' pilot burner; said last member" contracts and 1 said-"1atch'--means is thereby moved out" of en gagement with said "core'memberto DBIIHRZUIOSZ' ing thereof by saidrotary spring and a -rotary pilot *valve adapted-for,;connectionto--said ap+ pliance--to control-the as supply for==-saidpi-lot-- burner; said pilot valve being connected 'i'o'r con current rotation withfl said--- core member and-5 with saidcore *mem-bervand pilotvalve in th'e same -re1ativeposition-"whereby" said "core mem her and pilot valve-move"-simultaneouslyyto closed or open position andwhereby reinstituting the-flow-of gas-to saidpi1ot"upon -failure" thereof" can" be accomplished only -by simulta neonsly closing sai-d'passage to shut off the fiow ofgas-tog said mainburne'r.

8;" A 'control valve -for-a gas burning appliance having-'a-main burner and: apilot burner there in which comprisesin combination: a first va'lve' body portion adapted for a connection in the -fuel supply of-'said appliance-bavingatransversepassage therethrough adapted Whenso =con nected to deliver fuel to said main-burner;- a

second body -portionsecuredto said first 'bodyportion, adapted-for'connection 'in -the inclsi; plyof said-applhncesand having a second passage-therethrough adaptedwhenso connected to 7 portion; said pilot 1 valves member: having: an

opening :therethroughradapted ito: beg ali'gne 7." with said: second passage;:-:meanssefiectingg -4 driving: connectiorrgbetween: said; pilot valve member and ;said; -cor,e,-emember-:forz concurrent: rotationv ofzsaidglastz gtwo-imembers'artogsimulta1 neously' 013611511021: close. saidrV-passages:rmeanseine cludingeaz shoulder. on said.:core member andgz aim-abutment 2 in said rconicalmembeato -impart axial thrust from 1 said; 5 core; member ,t0 said-.

conicaly; member ;-in:.- a-: direction: to, hold saidfiO conical :memberin? gas tight engagement, with, said- :first body portion a: compression, spring positionedebetweensaid pilot'valve member andsaid coremember, said compression spring being adapted'to urge said axial pressure against said C5 core 7 member; a: thrust bearing between said piloti valve --member and (said. second .vbody, poor-l tion; a stenn portion in..- said cores member- 7 adapted: itogpermit rotation got :said core cmemz. ber :fr0m (outside-ofgsaid body; a transversev .pinJo in:saidistem=por-tionfipositioned ioutside of said, A body; a torsionispringmonnected betweenusaide transverserpin..and said .body,. said torsion. spring.,. being adaptedv to .1 urge, rotation of." sa'uL. cored sagera- 'latch member secured te -said body and adapted -to--'-engage-said transverse-pin to hold said'--'core memberin -an open position against the-urging --"ofsaid torsion springy and a heat responsive member mounted on-said control valveandarranged tobepositioned adjacent said-pilot-=burner when said body sections are connected-as aforesaid and operatively connectedto said latch member to :move the latter when said -heat- -responsive= member contracts whereby failurebf'said -pilot burner causes said heat I responsive member: to move said latch member=out of engagement "with said transverse pin-to permit-saidtorsion :spring to. close said core member.

95 The-=- construction set forth in: claim a 8 further? characterized by having 1 a -movable clutch -member carried by said control knob, said clutclsrmember being manually operable to engage said transverse pin-to connect said knob andsaid 'coremember for concurrent rotation of said-*1asttwo membersysaid clutch member being-=-further :adapted to make such engagement with said -transverse =pin= only-at arelative. position of said conical- -member andsaid core member at which onewf 4 said 1ast members is .;open andthe othep is cldsedwherebv-said core member may bearotated against "the -urging of said spring --to--reinstitute *fiow:ofxgas-to said pilot burner hy-engaging:said-clutch member and rotating saidiknoband 'w hereby release of said knob-or: release :of said. clutch member permits said torsion' spring. :to return :said core member to closedposition-unless: saiditransverse pin is engaged bysaidelatch member;

l0. lii a' ccntrol lvalve 'for: a 1 gas burning 7 appliancebf the type having a .main burner and a PiIGt blHT-IB'P, the :combination of means adapted for-connection to said 'appliance to supply fuel gasto: saidmainburner; separate means adapteel for-connection to said 7. appliance to supply fuel gas to=said pi1ot=burner;' a normally openwalve memberin said first means movable to a p osition -to--sh'ut oif said main burner supply-r-thermostatic valve means having a thermal element adapted--- to be positioned to respond-to the-heat -of-said--pilot burner and including --separate--valve: members for shutting o'i'l' said mainand pilot-burner supplies upon extinction of:-'saidpilot *burner; and means to reinstitute said pilot burner-supply, said last means including a manual control member for moving sa-id firstvalve member and means for connecting said first valve*member and separate valve members-flierconcurrent-movement of said members-to -move "said separate valve members to -open-position--by closing -movement of said firstvalve member AvYtL: MILLER;-

aereaancest crrsn Thefrfollowing references are--,of record inthe file of .thisepatentr U rlSTATES PA I'EN'IS" member in a direction to close said "first pas- 75 

